# Math Challenge

#### NinjaX3

My method
20 + 40=60, 60 +7=67, 67+8=75. What is your method?

#### DarnItJimImAnEngineer

For me, it goes, "sixty; sixty-seven; sixty-tenty-five," which is more-or-less the same thing.

2 people

#### topsquark

Math Team
My method
20 + 40=60, 60 +7=67, 67+8=75. What is your method?
An abacus.

-Dan

Math Team
60+15 = 75

2 people

#### NinjaX3

Cool! that's how you solve that problem in your mind.

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#### NinjaX3

For me, it goes, "sixty; sixty-seven; sixty-tenty-five," which is more-or-less the same thing.
That is interesting, how you came up with that. I hadn't thought of it that way. Brilliant!

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#### NinjaX3

An abacus.

-Dan
You could use that interesting.

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1 person

#### skeeter

Math Team
$27+48 = 3 \cdot 9+3 \cdot 16 = 3(9+16) = 3(25) = 75$

it's how Ramanujan would do it ...

1 person

#### NinjaX3

$27+48 = 3 \cdot 9+3 \cdot 16 = 3(9+16) = 3(25) = 75$

it's how Ramanujan would do it ...
Excellent, That is another way of doing it. [emoji106]

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